<template>
    <div>
        <div class="search">
            <input v-model="keyword" type="text" class="search-input" placeholder="输入城市名或拼音" />
        </div>
        <div class="search-content" ref="search" v-show="keyword">
            <ul>
                <li
                  class="search-item border-bottom "
                  v-for="item of list"
                  :key="item.id"
                  @click="handleCityClick(item.name)"
                >
                {{item.name}}
                </li>
                <li
                  class="search-item border-bottom "
                  v-show="hasNoData"
                >
                没有匹配到数据
                </li>
            </ul>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
export default {
  name: 'CitySeaarch',
  data () {
    return {
      keyword: '',
      list: [],
      timer: null
    }
  },
  computed: {
    hasNoData () {
      return !this.list.length
    }
  },
  props: {
    cities: Object
  },
  methods: {
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city)// 派发一个名字为changeCity的actions，然后把city传过去
      this.$store.commit('changeCity', city)
      this.$router.push('/')
    }
  },
  watch: {
    keyword () {
      if (this.timer) { // 节流优化
        clearTimeout(this.timer)
      }
      if (!this.keyword) {
        this.list = []
        return
      }
      this.timer = setTimeout(() => {
        const result = []
        for (let i in this.cities) { // 循环cities里面的内容
          this.cities[i].forEach((value) => { // 把cities数组里每个键值对里面的值再做一次遍历
            if (value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1) {
              result.push(value)
            }
          })
        }
        this.list = result
      }, 100)
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.search)
  }
}
</script>

<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.search
    touch-action: pan-y
    height: .72rem
    padding: 0 .1rem
    box-sizing: border-box
    line-height: .72rem
    width: 100%
    background-color: $bgColor

    .search-input
        box-sizing: border-box
        width:100%
        height: .62rem
        padding: 0 .1rem
        text-align: center
        border-radius: .06rem
        line-height: .62rem
        color: #666
.search-content
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    background-color: #eee
    z-index: 10
    .search-item
        background-color: #fff
        line-height: .62rem
        padding-left: .2rem
        color: #666
        box-sizing: border-box
</style>
